[libata] sata_mv: Minor cleanups and renaming, preparing for new EH & NCQ

Minor cleanups, new definitions, and code movement, preparing for
upcoming new-EH and NCQ changes.  This commit shoult not change behavior
at all.

Signed-off-by: Jeff Garzik <jeff@garzik.org>

1 files changed, 105 insertions, 57 deletions

diff --git a/drivers/ata/sata_mv.c b/drivers/ata/sata_mv.c
index 3873b29c80d6..8c554f2e69b0 100644
--- a/drivers/ata/sata_mv.c
+++ b/drivers/ata/sata_mv.c
@@ -108,8 +108,6 @@ enum {
         MV_SATAHC_ARBTR_REG_SZ  = MV_MINOR_REG_AREA_SZ,         /* arbiter */
         MV_PORT_REG_SZ          = MV_MINOR_REG_AREA_SZ,
 
-        MV_USE_Q_DEPTH          = ATA_DEF_QUEUE,
-
         MV_MAX_Q_DEPTH          = 32,
         MV_MAX_Q_DEPTH_MASK     = MV_MAX_Q_DEPTH - 1,
 
@@ -133,18 +131,22 @@ enum {
         /* Host Flags */
         MV_FLAG_DUAL_HC         = (1 << 30),  /* two SATA Host Controllers */
         MV_FLAG_IRQ_COALESCE    = (1 << 29),  /* IRQ coalescing capability */
-        MV_COMMON_FLAGS         = (ATA_FLAG_SATA | ATA_FLAG_NO_LEGACY |
-                                   ATA_FLAG_SATA_RESET | ATA_FLAG_MMIO |
-                                   ATA_FLAG_NO_ATAPI | ATA_FLAG_PIO_POLLING),
+        MV_COMMON_FLAGS         = ATA_FLAG_SATA | ATA_FLAG_NO_LEGACY |
+                                  ATA_FLAG_SATA_RESET | ATA_FLAG_MMIO |
+                                  ATA_FLAG_NO_ATAPI | ATA_FLAG_PIO_POLLING,
         MV_6XXX_FLAGS           = MV_FLAG_IRQ_COALESCE,
 
         CRQB_FLAG_READ          = (1 << 0),
         CRQB_TAG_SHIFT          = 1,
+        CRQB_IOID_SHIFT         = 6,    /* CRQB Gen-II/IIE IO Id shift */
+        CRQB_HOSTQ_SHIFT        = 17,   /* CRQB Gen-II/IIE HostQueTag shift */
         CRQB_CMD_ADDR_SHIFT     = 8,
         CRQB_CMD_CS             = (0x2 << 11),
         CRQB_CMD_LAST           = (1 << 15),
 
         CRPB_FLAG_STATUS_SHIFT  = 8,
+        CRPB_IOID_SHIFT_6       = 5,    /* CRPB Gen-II IO Id shift */
+        CRPB_IOID_SHIFT_7       = 7,    /* CRPB Gen-IIE IO Id shift */
 
         EPRD_FLAG_END_OF_TBL    = (1 << 31),
 
@@ -236,8 +238,10 @@ enum {
         EDMA_ERR_DEV_DCON       = (1 << 3),
         EDMA_ERR_DEV_CON        = (1 << 4),
         EDMA_ERR_SERR           = (1 << 5),
-        EDMA_ERR_SELF_DIS       = (1 << 7),
+        EDMA_ERR_SELF_DIS       = (1 << 7),     /* Gen II/IIE self-disable */
+        EDMA_ERR_SELF_DIS_5     = (1 << 8),     /* Gen I self-disable */
         EDMA_ERR_BIST_ASYNC     = (1 << 8),
+        EDMA_ERR_TRANS_IRQ_7    = (1 << 8),     /* Gen IIE transprt layer irq */
         EDMA_ERR_CRBQ_PAR       = (1 << 9),
         EDMA_ERR_CRPB_PAR       = (1 << 10),
         EDMA_ERR_INTRL_PAR      = (1 << 11),
@@ -248,6 +252,8 @@ enum {
         EDMA_ERR_LNK_CTRL_TX    = (0x1f << 21),
         EDMA_ERR_LNK_DATA_TX    = (0x1f << 26),
         EDMA_ERR_TRANS_PROTO    = (1 << 31),
+        EDMA_ERR_OVERRUN_5      = (1 << 5),
+        EDMA_ERR_UNDERRUN_5     = (1 << 6),
         EDMA_ERR_FATAL          = (EDMA_ERR_D_PAR | EDMA_ERR_PRD_PAR |
                                    EDMA_ERR_DEV_DCON | EDMA_ERR_CRBQ_PAR |
                                    EDMA_ERR_CRPB_PAR | EDMA_ERR_INTRL_PAR |
@@ -288,6 +294,7 @@ enum {
         /* Port private flags (pp_flags) */
         MV_PP_FLAG_EDMA_EN      = (1 << 0),
         MV_PP_FLAG_EDMA_DS_ACT  = (1 << 1),
+        MV_PP_FLAG_HAD_A_RESET  = (1 << 2),
 };
 
 #define IS_50XX(hpriv) ((hpriv)->hp_flags & MV_HP_50XX)
@@ -417,12 +424,30 @@ static void mv_channel_reset(struct mv_host_priv *hpriv, void __iomem *mmio,
                              unsigned int port_no);
 static void mv_stop_and_reset(struct ata_port *ap);
 
-static struct scsi_host_template mv_sht = {
+static struct scsi_host_template mv5_sht = {
+        .module                 = THIS_MODULE,
+        .name                   = DRV_NAME,
+        .ioctl                  = ata_scsi_ioctl,
+        .queuecommand           = ata_scsi_queuecmd,
+        .can_queue              = ATA_DEF_QUEUE,
+        .this_id                = ATA_SHT_THIS_ID,
+        .sg_tablesize           = MV_MAX_SG_CT,
+        .cmd_per_lun            = ATA_SHT_CMD_PER_LUN,
+        .emulated               = ATA_SHT_EMULATED,
+        .use_clustering         = 1,
+        .proc_name              = DRV_NAME,
+        .dma_boundary           = MV_DMA_BOUNDARY,
+        .slave_configure        = ata_scsi_slave_config,
+        .slave_destroy          = ata_scsi_slave_destroy,
+        .bios_param             = ata_std_bios_param,
+};
+
+static struct scsi_host_template mv6_sht = {
         .module                 = THIS_MODULE,
         .name                   = DRV_NAME,
         .ioctl                  = ata_scsi_ioctl,
         .queuecommand           = ata_scsi_queuecmd,
-        .can_queue              = MV_USE_Q_DEPTH,
+        .can_queue              = ATA_DEF_QUEUE,
         .this_id                = ATA_SHT_THIS_ID,
         .sg_tablesize           = MV_MAX_SG_CT,
         .cmd_per_lun            = ATA_SHT_CMD_PER_LUN,
@@ -530,38 +555,38 @@ static const struct ata_port_info mv_port_info[] = {
                 .port_ops       = &mv5_ops,
         },
         {  /* chip_508x */
-                .flags          = (MV_COMMON_FLAGS | MV_FLAG_DUAL_HC),
+                .flags          = MV_COMMON_FLAGS | MV_FLAG_DUAL_HC,
                 .pio_mask       = 0x1f, /* pio0-4 */
                 .udma_mask      = ATA_UDMA6,
                 .port_ops       = &mv5_ops,
         },
         {  /* chip_5080 */
-                .flags          = (MV_COMMON_FLAGS | MV_FLAG_DUAL_HC),
+                .flags          = MV_COMMON_FLAGS | MV_FLAG_DUAL_HC,
                 .pio_mask       = 0x1f, /* pio0-4 */
                 .udma_mask      = ATA_UDMA6,
                 .port_ops       = &mv5_ops,
         },
         {  /* chip_604x */
-                .flags          = (MV_COMMON_FLAGS | MV_6XXX_FLAGS),
+                .flags          = MV_COMMON_FLAGS | MV_6XXX_FLAGS,
                 .pio_mask       = 0x1f, /* pio0-4 */
                 .udma_mask      = ATA_UDMA6,
                 .port_ops       = &mv6_ops,
         },
         {  /* chip_608x */
-                .flags          = (MV_COMMON_FLAGS | MV_6XXX_FLAGS |
-                                   MV_FLAG_DUAL_HC),
+                .flags          = MV_COMMON_FLAGS | MV_6XXX_FLAGS |
+                                  MV_FLAG_DUAL_HC,
                 .pio_mask       = 0x1f, /* pio0-4 */
                 .udma_mask      = ATA_UDMA6,
                 .port_ops       = &mv6_ops,
         },
         {  /* chip_6042 */
-                .flags          = (MV_COMMON_FLAGS | MV_6XXX_FLAGS),
+                .flags          = MV_COMMON_FLAGS | MV_6XXX_FLAGS,
                 .pio_mask       = 0x1f, /* pio0-4 */
                 .udma_mask      = ATA_UDMA6,
                 .port_ops       = &mv_iie_ops,
         },
         {  /* chip_7042 */
-                .flags          = (MV_COMMON_FLAGS | MV_6XXX_FLAGS),
+                .flags          = MV_COMMON_FLAGS | MV_6XXX_FLAGS,
                 .pio_mask       = 0x1f, /* pio0-4 */
                 .udma_mask      = ATA_UDMA6,
                 .port_ops       = &mv_iie_ops,
@@ -709,6 +734,41 @@ static void mv_irq_clear(struct ata_port *ap)
 {
 }
 
+static void mv_set_edma_ptrs(void __iomem *port_mmio,
+                             struct mv_host_priv *hpriv,
+                             struct mv_port_priv *pp)
+{
+        /*
+         * initialize request queue
+         */
+        WARN_ON(pp->crqb_dma & 0x3ff);
+        writel((pp->crqb_dma >> 16) >> 16, port_mmio + EDMA_REQ_Q_BASE_HI_OFS);
+        writelfl(pp->crqb_dma & EDMA_REQ_Q_BASE_LO_MASK,
+                 port_mmio + EDMA_REQ_Q_IN_PTR_OFS);
+
+        if (hpriv->hp_flags & MV_HP_ERRATA_XX42A0)
+                writelfl(pp->crqb_dma & 0xffffffff,
+                         port_mmio + EDMA_REQ_Q_OUT_PTR_OFS);
+        else
+                writelfl(0, port_mmio + EDMA_REQ_Q_OUT_PTR_OFS);
+
+        /*
+         * initialize response queue
+         */
+        WARN_ON(pp->crpb_dma & 0xff);
+        writel((pp->crpb_dma >> 16) >> 16, port_mmio + EDMA_RSP_Q_BASE_HI_OFS);
+
+        if (hpriv->hp_flags & MV_HP_ERRATA_XX42A0)
+                writelfl(pp->crpb_dma & 0xffffffff,
+                         port_mmio + EDMA_RSP_Q_IN_PTR_OFS);
+        else
+                writelfl(0, port_mmio + EDMA_RSP_Q_IN_PTR_OFS);
+
+        writelfl(pp->crpb_dma & EDMA_RSP_Q_BASE_LO_MASK,
+                 port_mmio + EDMA_RSP_Q_OUT_PTR_OFS);
+
+}
+
 /**
  *      mv_start_dma - Enable eDMA engine
  *      @base: port base address
@@ -720,9 +780,10 @@ static void mv_irq_clear(struct ata_port *ap)
  *      LOCKING:
  *      Inherited from caller.
  */
-static void mv_start_dma(void __iomem *base, struct mv_port_priv *pp)
+static void mv_start_dma(void __iomem *base, struct mv_host_priv *hpriv,
+                         struct mv_port_priv *pp)
 {
-        if (!(MV_PP_FLAG_EDMA_EN & pp->pp_flags)) {
+        if (!(pp->pp_flags & MV_PP_FLAG_EDMA_EN)) {
                 writelfl(EDMA_EN, base + EDMA_CMD_OFS);
                 pp->pp_flags |= MV_PP_FLAG_EDMA_EN;
         }
@@ -739,12 +800,12 @@ static void mv_start_dma(void __iomem *base, struct mv_port_priv *pp)
  *      LOCKING:
  *      Inherited from caller.
  */
-static void mv_stop_dma(struct ata_port *ap)
+static int mv_stop_dma(struct ata_port *ap)
 {
         void __iomem *port_mmio = mv_ap_base(ap);
         struct mv_port_priv *pp = ap->private_data;
         u32 reg;
-        int i;
+        int i, err = 0;
 
         if (MV_PP_FLAG_EDMA_EN & pp->pp_flags) {
                 /* Disable EDMA if active.   The disable bit auto clears.
@@ -764,10 +825,13 @@ static void mv_stop_dma(struct ata_port *ap)
                 udelay(100);
         }
 
-        if (EDMA_EN & reg) {
+        if (reg & EDMA_EN) {
                 ata_port_printk(ap, KERN_ERR, "Unable to stop eDMA\n");
                 /* FIXME: Consider doing a reset here to recover */
+                err = -EIO;
         }
+
+        return err;
 }
 
 #ifdef ATA_DEBUG
@@ -884,12 +948,13 @@ static void mv_scr_write(struct ata_port *ap, unsigned int sc_reg_in, u32 val)
                 writelfl(val, mv_ap_base(ap) + ofs);
 }
 
-static void mv_edma_cfg(struct mv_host_priv *hpriv, void __iomem *port_mmio)
+static void mv_edma_cfg(struct ata_port *ap, struct mv_host_priv *hpriv,
+                        void __iomem *port_mmio)
 {
         u32 cfg = readl(port_mmio + EDMA_CFG_OFS);
 
         /* set up non-NCQ EDMA configuration */
-        cfg &= ~(1 << 9);       /* disable equeue */
+        cfg &= ~(1 << 9);       /* disable eQue */
 
         if (IS_GEN_I(hpriv)) {
                 cfg &= ~0x1f;           /* clear queue depth */
@@ -971,28 +1036,9 @@ static int mv_port_start(struct ata_port *ap)
         pp->sg_tbl = mem;
         pp->sg_tbl_dma = mem_dma;
 
-        mv_edma_cfg(hpriv, port_mmio);
-
-        writel((pp->crqb_dma >> 16) >> 16, port_mmio + EDMA_REQ_Q_BASE_HI_OFS);
-        writelfl(pp->crqb_dma & EDMA_REQ_Q_BASE_LO_MASK,
-                 port_mmio + EDMA_REQ_Q_IN_PTR_OFS);
-
-        if (hpriv->hp_flags & MV_HP_ERRATA_XX42A0)
-                writelfl(pp->crqb_dma & 0xffffffff,
-                         port_mmio + EDMA_REQ_Q_OUT_PTR_OFS);
-        else
-                writelfl(0, port_mmio + EDMA_REQ_Q_OUT_PTR_OFS);
-
-        writel((pp->crpb_dma >> 16) >> 16, port_mmio + EDMA_RSP_Q_BASE_HI_OFS);
+        mv_edma_cfg(ap, hpriv, port_mmio);
 
-        if (hpriv->hp_flags & MV_HP_ERRATA_XX42A0)
-                writelfl(pp->crpb_dma & 0xffffffff,
-                         port_mmio + EDMA_RSP_Q_IN_PTR_OFS);
-        else
-                writelfl(0, port_mmio + EDMA_RSP_Q_IN_PTR_OFS);
-
-        writelfl(pp->crpb_dma & EDMA_RSP_Q_BASE_LO_MASK,
-                 port_mmio + EDMA_RSP_Q_OUT_PTR_OFS);
+        mv_set_edma_ptrs(port_mmio, hpriv, pp);
 
         /* Don't turn on EDMA here...do it before DMA commands only.  Else
          * we'll be unable to send non-data, PIO, etc due to restricted access
@@ -1088,7 +1134,7 @@ static void mv_qc_prep(struct ata_queued_cmd *qc)
         u16 flags = 0;
         unsigned in_index;
 
-        if (ATA_PROT_DMA != qc->tf.protocol)
+        if (qc->tf.protocol != ATA_PROT_DMA)
                 return;
 
         /* Fill in command request block
@@ -1180,7 +1226,7 @@ static void mv_qc_prep_iie(struct ata_queued_cmd *qc)
         unsigned in_index;
         u32 flags = 0;
 
-        if (ATA_PROT_DMA != qc->tf.protocol)
+        if (qc->tf.protocol != ATA_PROT_DMA)
                 return;
 
         /* Fill in Gen IIE command request block
@@ -1241,17 +1287,19 @@ static void mv_qc_prep_iie(struct ata_queued_cmd *qc)
  */
 static unsigned int mv_qc_issue(struct ata_queued_cmd *qc)
 {
-        void __iomem *port_mmio = mv_ap_base(qc->ap);
-        struct mv_port_priv *pp = qc->ap->private_data;
+        struct ata_port *ap = qc->ap;
+        void __iomem *port_mmio = mv_ap_base(ap);
+        struct mv_port_priv *pp = ap->private_data;
+        struct mv_host_priv *hpriv = ap->host->private_data;
         unsigned in_index;
         u32 in_ptr;
 
-        if (ATA_PROT_DMA != qc->tf.protocol) {
+        if (qc->tf.protocol != ATA_PROT_DMA) {
                 /* We're about to send a non-EDMA capable command to the
                  * port.  Turn off EDMA so there won't be problems accessing
                  * shadow block, etc registers.
                  */
-                mv_stop_dma(qc->ap);
+                mv_stop_dma(ap);
                 return ata_qc_issue_prot(qc);
         }
 
@@ -1264,7 +1312,7 @@ static unsigned int mv_qc_issue(struct ata_queued_cmd *qc)
 
         in_index = mv_inc_q_index(in_index);    /* now incr producer index */
 
-        mv_start_dma(port_mmio, pp);
+        mv_start_dma(port_mmio, hpriv, pp);
 
         /* and write the request in pointer to kick the EDMA to life */
         in_ptr &= EDMA_REQ_Q_BASE_LO_MASK;
@@ -1379,7 +1427,8 @@ static void mv_host_intr(struct ata_host *host, u32 relevant, unsigned int hc)
         void __iomem *hc_mmio = mv_hc_base(mmio, hc);
         struct ata_queued_cmd *qc;
         u32 hc_irq_cause;
-        int shift, port, port0, hard_port, handled;
+        int port, port0;
+        int shift, hard_port, handled;
         unsigned int err_mask;
 
         if (hc == 0)
@@ -1458,10 +1507,9 @@ static void mv_host_intr(struct ata_host *host, u32 relevant, unsigned int hc)
 }
 
 /**
- *      mv_interrupt -
+ *      mv_interrupt - Main interrupt event handler
  *      @irq: unused
  *      @dev_instance: private data; in this case the host structure
- *      @regs: unused
  *
  *      Read the read only register to determine if any host
  *      controllers have pending interrupts.  If so, call lower level
@@ -1965,7 +2013,7 @@ static void __mv_phy_reset(struct ata_port *ap, int can_sleep)
         void __iomem *port_mmio = mv_ap_base(ap);
         struct ata_taskfile tf;
         struct ata_device *dev = &ap->device[0];
-        unsigned long timeout;
+        unsigned long deadline;
         int retry = 5;
         u32 sstatus;
 
@@ -1983,14 +2031,14 @@ comreset_retry:
         sata_scr_write_flush(ap, SCR_CONTROL, 0x300);
         __msleep(20, can_sleep);
 
-        timeout = jiffies + msecs_to_jiffies(200);
+        deadline = jiffies + msecs_to_jiffies(200);
         do {
                 sata_scr_read(ap, SCR_STATUS, &sstatus);
                 if (((sstatus & 0x3) == 3) || ((sstatus & 0x3) == 0))
                         break;
 
                 __msleep(1, can_sleep);
-        } while (time_before(jiffies, timeout));
+        } while (time_before(jiffies, deadline));
 
         /* work around errata */
         if (IS_60XX(hpriv) &&
@@ -2427,7 +2475,7 @@ static int mv_init_one(struct pci_dev *pdev, const struct pci_device_id *ent)
 
         pci_set_master(pdev);
         return ata_host_activate(host, pdev->irq, mv_interrupt, IRQF_SHARED,
-                                 &mv_sht);
+                                 IS_GEN_I(hpriv) ? &mv5_sht : &mv6_sht);
 }
 
 static int __init mv_init(void)